“物极必反”可以用来形容阴阳之间的对立制约关系。()
参考答案:错
In order to put an end to poverty, the World Bank has switched its ______to providing technical assistance and long-term loans to developing countries.
A.concern
B.process
C.struggle
D.focus
下图所示为一种数字签名方案,网上传送的报文是 (62) ,防止A抵赖的证据是 (63) 。
62()
A.P
B.DA(P)
C.EB(DA(P))
D.DA